import tensorflow as tf
import numpy as np

x_data = np.random.rand(100).astype(np.float32)
y_data = x_data*0.1+0.3

Weights = tf.Variable(tf.random_uniform([1],-1.0,1.0))
biases = tf.Variable(tf.zeros([1]))

y=Weights*x_data+biases

loss = tf.reduce_mean(tf.square(y-y_data))
op = tf.train.GradientDescentOptimizer(0.5)
train = op.minimize(loss)

init = tf.initialize_all_variables()

sess = tf.Session()
sess.run(init)

for step in range(200):
    sess.run(train)
    if step%20==0:
        print(step,sess.run(Weights),sess.run(biases))